Blowtorch



July l0, 1945.

H. W. JONES BLowToRcH Filed July 2:5, 1941 Patented July 1l),` 1945 l poration off NewYork *nemer W. `Jones, Wested, N. ,1., assigner to Union Carbide and Carbon` Corporationga corff j -iroiaims 11.1584214) This inventionrrelatesltoza blowtorch havngan improved y gas-mixingli assembly :which is; simple and inexpensive tor-construct, `:yetinsures improved mixing Aof `the combustible andcombustion-supporting :gases Whilemaintaining @gas-tight4 joints in thesblowtorch; Eheinvention also relates .to such ,animproved f blowtonch including as simple and .inexpensivedisc-type gas-mixergnozzlewhich may ben` easilyl iremoved from the blowtorch for cleaning ,fof .freplacement f l It `thas 1beenafound desirable r iniblowtorches to vprovide l doubleiseats :for the gasfmixinginozzle, l one seat being, adjacent -to lthefront. ofthe nozzle to providefa Very accurately proportioned mixing gap in front 'of Vthe f nozzle; and the vother l being adjacentito theback of `the-nozzle to: providea `seal against (the escape `oi lgas rpast theinozzle.

Heretoforait has `been-foundimpossible .to pro` videw-such ldouble Aseats Without." raising thel cost oi'. thel :nozzle prohibitively, f because extremely accurate machining. offallnparts tof` closetolerances has been required to-z insure thatthenozzle will engage both :seats firmly. v; u The principalobjectfof.the presentd'nvention is to provideavblowtorch havingal simple and inexpensive -noVel l gas-zrnixing Aassembly.` provided with r double `:seatsl- :Another objectf is the `provision. ofa blowtorch including? a: simple and, inexpensivedisc-type.inixerfnozzle which will. cover a widerange of gas .consumption `for different urged. against .the abutinent;l member .bra clamnf ing member seated on .thesecondshoulden meme` ber,` and bearing againstthe rearwend ofthe mixer nozzle member., Yieldable means is interposed between two of Ythe. :oo1:1eratr1g` membersitotake up any ,slack due .tominequalites `in machining. Preferably .the yieldable means is .a sharp pointed annularboss integral withoneof themembers,

Wliielnyields to `and is. slightly crushedor, compressed by the,,membercooperating therewith, thus compensating for. inequalities; in Vniacljlining and4 permitting .i accurate seatingA of the twoA parts of the .nozz1e assemblyagainstone another: and against fthe two shoulders in .the-,chamber to .prof vide tight joints. Instead of an annulanyielde able bossintegral .with one .of .the members .L of

l' the nozzle vfasselribly, fa, sel'iaratef` member `ofyield-4 able materialmay belinterposedbetween `the two Cooperatingmembersindesired.

The invention Willlloe` described..more.I

` ularlyf hereinaiten by way of ...exampler only, as

ame adjustments, yet which may be quicklyand easilyremovedcfor'cleaningor replacement.`

l The abovewand-lotherzobjeets; andthe -lnovel features,` of lthe.invention,` will become', apparent from -the following: description, having reference to the annexed draWing-,iwhereim l r` Fig.` 1 is-a, side elevationalrview;partlybroken Gef-6` inpligs;A andfifrespect-ively; and 1 Iig. 7 isazcross-sectional view taken along the lineil-,lvinnFilL l l `Inuaceordancewith .the invention, there is provided-ar `blowtorch having@` a fhamber foraf gasmixingtassembly, 1. anwannulart shoulderadjacent to fthe; front` .ofitheicharnberffforming anr abutment member,A and ...a1 Second shoulder 4member .spaced from the ;abutmentwmember. :IA. simple .discslfiaped:` mixer-nozzlefmember fin thefchamber `is embodied in awning .mentoren attachment of the ,mediumfpressure f. acetylene typeV which is adapted, to be coupled intol aniordinall'y .welding blowpipe handle foruselin. cutting.steelandiron,

The terms l oxyge11. and (fat:etyleneV willbe. used 4 hereinafter, for simplicity,` to. denote anyjsuitf able .combustionsupporting .gas and any .suitable fuel. gas,respetively. As. .shown :in l the .drawing` the` blowtorcli. comprises ,al head member] l4 ,connected toa .rlalibody I2 by a tube I3.A for cutting QXygen,- andatube i4 fora combustible gas ,mixture A .cutting tip I 6,

of` Ya well-known type, having@oentlialolitlet Vfor oxygen anda plurality of outletsdona,preheating combustible gas mixture surrounding the central outlet, is. secured `in ,the head member [l I.. by the usual `coupling H nut Il.` A connecting-nipple I8 carryinga .coupling nutleandladadaptor disc 20, and` 5 having f-appropriate. ;separate passages therein,` forooxygeng and acetylene gases,- .is threadedinto .the rear ,end of the. body: ,Mend is adapted. `to be lcoupledlto a .welding. blowtorch handle, `such as fthe.. handle., of i'.l'1e 4 bloslltorch shown in Patent No.. V2,242,471. issuedMame, 1.1941;

y A. longitudinally .extending ,cylindrical i chamber .,2 I in the', lower .portion of the r-.ean body I 2 has an; annular shoulder or abutment y,22, .close to, ,but spaced .slightly; fron 1, l the forward end of the chamber,- anda second` annular shoulder ,23 spaced from the. shoulder 22 intermediate ,the ends of the chamber. An ,int erna.1ly threaded portion. -24 `of .the wall,y of the chamberl extends rearwardly to l therear surface oi` the` body I2,

partie;

opens centrally from the front of the chamber 2| for conducting a combustible gas mixture to 1 the tube I4, which is secured, as by silver soldering, Within a counterbore in the front of the body I2.

A small cylindrical disc-shaped mixer nozzle 28 in the chamber 2| is seated on the annular shoulder 22 with its flat front face accurately and uniformly spaced from the front wall 29 of the chamber, forming a mixing gap 33. The nozzle,J 28 is provided with a central passage 3l for acetylene, and a plurality of eccentricallyarranged passages 32 for gaseous oxygen arranged on an annular zone surrounding the central passage 3|. The passages 32 open at their front ends into the narrow mixing gap 33 adjacent to the periphery of the latter. An annular sharp pointed boss 34, which may be'of generally triangular cross section, projects rearwardly from the nozzle Aintermediate the central passage 3| and the annular zone of the-passages 32. The boss 34 providesa yieldable and easily crushable means fortakng up any inequalities in the machining of the various parts of the mixing assembly, as well as providing for a gas-tight joint between the cooperating parts.

The nozzle 2-8 is clamped tightly in position against the abutment 22 by a clamping member 36 Vthreadedin the chamber 2l and having a shoulder seated on the shoulder 23. thereby providing a gas-tight seal preventing the escape of gas rearwardly along the outside of the clamping member. A reduced diameter cylindrical portion 31of the clamping member 36 extends ahead annular sharp-edged boss is made of a material having a greater hardness than that of the member bearing thereon, it is evident that the boss will form an indentation in the softer metal, thereby compensating for inaccuracies in machining as though the boss itself had been crushed or compressed. Also, the boss member 34 may be constructed of a metal having greater or lesser hardness than the base metal ofthe nozzle and welded or otherwise secured thereto.

i `In the operation of the blowtorch, acetylene from a central passage 46 in the nipple I8 is conducted by way of a passage 41 in the body I 2 directly to the space 44, from whence it passes through the central passages 39 and 3| in the clamping member 36 and the nozzle 28, respecof the shoulder23 in spaced relation to the wall of the chamber 2|,4`and bears at its forward end against the boss- 34 with a slight crushing action `to provide perfect engagement between the several cooperating surfaces. An annular laterally projecting flange 38adjacent to the forward end The rear end of the chamber 2| is plugged` bya closure comprising an. externally threaded plug 42 threaded into the rear end of the chamber. A shoulder 43 intermediate the ends of the plug 42 is seated firmly against the rear face of the body I2 within the counterbore 26 to provide a seal against the leakage of gas to the atmosphere from the chamber 2|. At its inner end, the plug 42 terminates a substantial distance in back of the rear end of the clamping member 36,-thus` providing a space 44 in back of the clamping member for the introduction of gaseous acetylene into the chamber 2|.

The mixer nozzle 28 and the clamping screw A 36 are desirably made of bronze, the sharp pointed screw 36 instead of on the nozzle 26. When the ranged passages 48 in the connecting nipple I8 is discharged into a cavity 49 in the rear end` of the body I2, from whence it is conducted by way of a passage 5| to a valve chamber 52, containing a valve 53 operable by a lever 54 for controlling the admission of cutting oxygen to the tube I3.` A second oxygen passage 56 inthe body I2 (see Fig. 7) takes off fromthe intake side of the valve chamber 52 for conducting gaseous oxygen to the second valve chamber'51 containing a needle valve 58 controlling the admission of gaseous oxygen to the chamber'2l. 'From the valve chamber 51, a short passagef59fleads to the chamber 2| on the side of thebale 38 remote from the nozzle 28, for discharging the gaseous oxygen into the annular space surrounding the annular boss 34 and the forwardly projecting portion 31 of the clamping screw 36. The gaseous oxygen from the chamber 2| then is uniformly distributed to the several passages 32 in the mixer nozzle 28, and is discharged into the narrow mixing gap 33 at the front of the nozzle adjacent to the periphery of thegap. The gaseous oxygen flows inwardly in the gap 33 perpendicularly to the central stream of acetylene from all sides thereof and mixes intimately therewith. The combustible gas mixture becomes more completely mixed during its passage through the passage 21 andthe tube I4 to the head Il, from which itis delivered to the'tip I6 to provide a preheating flame.

i 'I'he mixing assembly may be removed from the blowtorch for cleaningv or replacement Asimply by removing the closure plug 42 and unthreading the clamping member 36 from the chamber 2|, after which the mixer nozzle 28v may be dropped from thechamber.

A specilcembodiment of the present invention has been described by way of example only, and scope of the invention is not to be limited to the specific embodiment described because changes in construction and arrangement within the spirit `of the invention may be made by those skilled pressing action, thereby providing for accurate".

Af--against thewmember c'ooperatingitherewth; 1

@2uAiiblowtorchhavmgz a chamber a abutment 'inl saidchaimber;` nafannularjshbulder spacedl fromAv said abutmen ,i

` annular shoulder; and one' `of lsaid'n'iembershavving lai'yieldableibossintegial therewithri tlieother i cci said members bearingjrag'ainst:saidbossawithf a slightcompressing action, thereby providing forI accurate seating of said clamping member on said shoulder. i a a 3. A blowtorch having a chamber; an abutment` in said chamber; an annular shoulder spaced from said abutment; a mixer nozzle in said chamber abutting at one end thereof against said abutment, said mixer nozzle having an anarmixerl. nozzle'mem- "ber inssaid.chamber,abuttinglagainsti-lsaid Ii'abutment ma: clamping:` member said; cliamber,i gastightly engagin'gsaidi mixercnozzleimember; said ing afcentral first-#gaspassage,` and a plurality of` second-,gaas fpassages arranged on `a` zone? sure rounding said central passagega clampingmemf `ber in' said chamber gasfftightly engaging both said :annular shoulderfandsaidjfmixer `nozzle member; lsaid-'clampinghmemberhaving a passage and "comprising" a portion `extending ahead i of said annular shoulder in spaced relation tothe nular yieldable boss projecting fromtl'ie opposite end thereof; and a clamping member in said chamber gas-tightly engaging said annular shoulder, said clampingmember bearing against said `boss with a slight compressing action, thereby providing a gas-tight joint between said mixer nozzle and said clamping member, and providing for accurate seating of said said shoulder.

4. A blowtorch having a chamber; a gas-mix-` ture passage leading from said chamber; an abut` ment adjacent to one end of said chamber; an

annular shoulder spaced from said abutment; a mixervnozzle in said chamber abutting against` said abutment, said nozzle having a central iirst-` gas passage, and a plurality of second-gas pas sages arranged on a zone surrounding said central passage, said mixer nozzle also having a sharp pointed yieldable `annular boss projecting rearwardly between said centralipassage and said zone; a clamping member in said chamberbear-` ing against said boss with a slight compressing action and forming a seal between said central passage and said lsecond-gas 1` passages, said clamping member also accurately engaging said i annular shoulder in gas-tightlrelationship thereto, and said clamping member having a passage; an `annular space surrounding said boss for,` distributing gas to said second-gas passages; a passage for introducing a iirst-gasinto the passage in said clamping member; and a passage for introducing a second-gas into said annular space.

5. A blowtorch comprising `a body having a chamber extending inwardly from one surface thereof, said chamber having a wall; a gas mixture passage leading from said chamber; an abutment in said chamber; an annular shoulder clamping` member on wall of said chambenfproviding an annular space; one of said members including an annular yield-` able `boss integral therewitlnthe other of said members bearing against said boss with a slight compressing action to provide a`gastight seal preventing gas leakage between said annular space andsaid `central passage, and to provide i for accurate seating of said `clamping member `on said shoulder; a passage for introducing a said shoulder includes an annularbaiiie projectfA first-gas into the passage in said clamping memf ber; and a passage `for introducing a second-gas into said annular space. Y

7. A blowtorch as `claimed in claim 6 wherein the portion of said clamping member ahead of ing toward the wall of said chamber,l and where.`

l in the passagefor introducingsaid second-gas into said annular space opens into the latter on the side of said baille remote from said mixer Mmember. i

` 8. In combinatioma body having a chamber;

an abutment in said chamber; a shoulder` spaced 'from said abutment; a rst member in said a f chamber abutting at` one end against said abutsaid first member having han annular shoulder. i a

9. A blowtorch having a bodyprovided with a chamber having a wall, said chamber having an entrance in one surface of said body; mixer nozn zle means in said chamber; means cooperating with said mixer nozzle means for spacing the latter from the end of said chamber remotefrom spaced from said abutment; a mixer nozzle memi ber abutting against said abutment, said mixer nozzle member having separate passages therethrough; a clamping member in said chamber gas-tightly engaging both said annularV shoulder and said mixer nozzle member, said clamping member having a passage; `one Vof said members including an annular yieldable `boss spaced from said wall, the other of said members bearing i against said boss with a slight compressing action to provide a gas-tight seal -between said separate passages, and to provide accurate seating of said clamping member on said shoulder; a closure in said chamber in spaced relation tosaid clamping member; and separate passages in saidfbody for;

supplying gases to the space `between said annular boss and said wall, and to the space between said clamping means and said closure;

said entrance; clampingmeans threaded tothe Wall of said chamber and engaging said mixer nozzlemeans; and shoulder means in said chamber facing toward said entrance and cooperating l'with said clampingymeans to provide a `Seal against the `flow of gas around said clamping means; one `of said means including deformable material adapted to yield slightlyunder the pres` `sure of the meanscooperating therewith, where*-` by said-clamping means accurately engages both said shoulder means and said mixer nozzle means.

`10. `A `blowtorch having a body provided with a chamber having a` wall, said chamber having an entrance in one surface of said body; a first shoulder insaid chamber near the end thereof remote, from `said entrance, and facing `toward the latter; asecond shoulderin said chamber between said rst shoulder and said entrance, and

`facing toward the latter; a mixer nozzle member in said chamber seated on said iirst shoulder; and a clamping member in'said chamber thread"- ed to the wall thereof and seated on said second l 6.. A'.b1owtorchhavingza chamber; a gas-,mix- `turel passage leading from saidchamber; anfabutment adjacent tofone endusofl said chamber; an. annular `shoulder spaced4 from i said c abutment; a

mixeri nozzle` member in `said chamber abutting shoulder to provide a seal against the iiow of-gas around said clamping member, said clamping member also engaging said mixer nozzle member; one of said members including a portion of deformable material adapted to yieldv slightly under the pressureof the other of said members, whereby said clamping member accurately engages both said second shoulder and said nozzle member.

11. A blowtorch having a chamber; an abutment member in said chamber; an annular shoul- 'said abutment member; and a clamping member in said chamber gas-tightly seated onboth sai shoulder member 'and said mixer nozzle memb and holding the latter against said abutment member; a rst'one of said members including a sharp pointed annular boss integral v therewith bearing against a second one of said members, one of said rst and second members yielding slightly under the pressure of the other of said rst and second members, whereby said clamping member accurately seats on both said shouldermember and said mixer nozzle member. Y

HOMER W. JONES. 

